The drop manholes are provided in a sewerage system when there is

1.	The drop manholes are provided in a sewerage system when there is
A.	change in alignment of sewer line
B.	change in size of sewers
C.	change in the elevation of ground level
D.	change from gravity system to pressure system
Answer» D. change from gravity system to pressure system

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The drop manholes are provided in a sewerage system when there is

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